That's always been possible. The recording industry just doesn't want it to be so siple that every dopey 90 IQ teenager can burn a CD easier than charging one to her dad's credit card at the mall.
I don't doubt what you suspect. And I don't have any hard data, but I suspect that without our help, they die at exceptionally high rates from illnesses we cure. I also suspect that they clash and war over resources that would be sufficient to maintain more than 10 times their numbers in modern societies, with all our neurosis producing stresses. Additionally, I suspect that the time of many primitive people that where at one time potentially brilliant is taken up by tedious, unrewarding and unchallenging tasks needed to survive, however therapeutic they may be.